User`s guide

SET MM
(MM)
Sets the MM magtape handler (TJU16/TJE16/TU45/TJU77 magtapes).
Format
SET MM condition
Condition
CSR=n
Uses n as the CSR address for the MM handler. The valid range for n is 160000
to 177570
8
. This option enables you to set a special CSR value in the device
handler without having to modify and reassemble the handler source code.
DEFALT=9
Sets the default settings for 9-track magtape. The 9-track defaults are:
DENSE=809
ODDPAR
DENSE=density
Sets density for the 9-track tape handler. Do not alter the density setting within
a volume. A density setting of 1600 bpi (bits per inch) automatically sets parity
to odd. The valid density settings for 9-track tape are:
800 (or 809) bpi
1600 bpi
The default is 800.
[NO]ODDPAR
ODDPAR, the default, sets parity to odd for 9-track tape. Digital recommends
this setting.
NOODDPAR sets parity to even for 9-track tape. Digital does not recommend
this setting for normal operation and provides it only for compatibility with other
systems.
RETRY=n
Specifies the number of times the device handler attempts to recover from an I/O
error. The value n must be an integer in the range 1 through 127. The default
value for n is 8.
VECTOR=n
Modifies the MM handler to use n as the vector address. The valid range for n is
100
8
to 474
8
. This option enables you to set a special vector value in the handler
without having to modify and reassemble the handler source code.
RT–11 Command Descriptions 251